Canadian Coastal Information System (CIS) - Change Mapping, Beaufort Sea Coast 1984, 1999 and 2000

Shore-zone classification data for the Canadian Beaufort Sea coast form part of a GIS database, the Coastal Information System (CIS), developed and maintained by the Geological Survey of Canada (GSC-Atlantic), Natural Resources Canada, at the Bedford Institute of Oceanography in Dartmouth, NS. Coastal attributes in the CIS have been interpreted and mapped from low-level, oblique, aerial photography and video imagery with accompanying audio commentary. The CIS is hierarchical in that coastal forms are classified based on four increasingly detailed levels of description. The coastal data consist of line segments with attributes describing the physical form and material at scales ranging from 1:10 000 to 1:250 000. In the CIS, the coast is divided into three shore-parallel zones (backshore, foreshore, nearshore). Each zone is segmented separately based on homogeneous physical characteristics. A glossary has been developed to control the language used to describe each zone. The use of objective physical criteria for coastal classification enhances the utility of the CIS for a wide variety of applications. Qualitative coastal change was mapped along select portions of the coast based on the availability of overlapping, multi-year coastal video and aerial photography. Change mapping comments are based on the direction of change (erosion, aggradation, and re-orientation), the extent of change (moderate, extensive, not discernable), or changes in specific features or materials (spit formation, mud flows, retrogressive thaw failures, accumulation of driftwood). Coastal changes over the intervals of 1984 to 1999, and 1999 to 2000 were mapped based on repeat, oblique aerial video coverage. Along a small section of coastline, longer term changes were estimated based on a comparison between 1958 aerial photography and 1999 oblique aerial video. For more information please refer to the datafile entitled: CCIN12125_20150218_Change_Mapping_Extended_Metadata_FGDC.xml

加拿大波弗特海海岸带分类数据，是加拿大自然资源部大西洋地质调查局（Geological Survey of Canada (GSC-Atlantic)）在新斯科舍省达特茅斯贝德福德海洋研究所开发维护的地理信息系统（Geographic Information System, GIS）数据库——海岸信息系统（Coastal Information System, CIS）的组成部分。
该系统内的海岸属性数据，通过低空倾斜航空摄影与附带音频解说的视频影像解译并勾绘而成。海岸信息系统采用分层架构，海岸地貌基于四级精度逐步提升的描述标准完成分类。
海岸数据以线段为基本存储单元，附带描述物理形态与物质组成的属性信息，制图比例尺覆盖1:10000至1:250000。在该系统中，海岸被划分为三个平行于岸线的带区：后滨（backshore）、前滨（foreshore）与近岸（nearshore），每个带区均依据均一的物理特征单独分割。系统同时编制了专属术语表，以统一各带区的描述语言。采用客观物理标准开展海岸分类，显著提升了海岸信息系统在多类应用场景中的实用性。
基于重叠覆盖的多年期海岸视频与航空摄影数据，研究人员对部分选定岸段开展了定性海岸变化解译。变化标注依据包括变化方向（侵蚀、加积、岸线取向调整）、变化范围（中等、广泛、难以辨识），或是特定地貌与物质变化（沙嘴形成、泥流、退化式冻融坍塌、浮木堆积）。其中，1984年至1999年、1999年至2000年的海岸变化数据，通过重复获取的倾斜航空视频影像解译得到。在一小段岸线上，研究人员通过对比1958年航空摄影与1999年倾斜航空视频影像，估算了其长期海岸变化。
如需获取更多信息，请参阅名为CCIN12125_20150218_Change_Mapping_Extended_Metadata_FGDC.xml的数据文件。